Ted has a point re looseness being a mostly a break action problem. I have yet to see a loose Darne or Charlin.
Friction in an engine revving at thousand of RPM takes years to wear a gap like that seen in a loose double. It is unlikely to be the sole cause for wear and looseness.
Action flexing is indicated as the primary, if not the only form of action dynamics during firing. The barrels are usually assumed to be totally inert and unaffected by pressure even though they are soft and malleable and actions are stiff and hardened.
Radial expansion and axial contraction in thick walled cylinders (such as barrels), are systematically ignored in the analysis. Even though the phenomenon must cause pounding between barrel and action during the recovery phase.
Last edited by Shotgunlover; 02/10/17 02:57 AM.
